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KB85035
SNAP PAC brains: Large data stream sizes cause corruption and/or reset
Revision:  2.0
Published:  12/10/2015
Applies To
SNAP-PAC-R1
SNAP-PAC-R1-B
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-R2-W
SNAP-PAC-EB1
SNAP-PAC-EB1-FM
SNAP-PAC-EB1-W
SNAP-PAC-EB2
SNAP-PAC-EB2-FM
SNAP-PAC-EB2-W
OPTOEMU-SNR-3V
OPTOEMU-SNR-DR1
OPTOEMU-SNR-DR2
G4EB2
G4D32EB2
G4D32EB2-UPG
Versions
Problem affects:  
Firmware, all versions
Problem is fixed in version:  
PAC Firmware R9.4c

SYMPTOMS

On a SNAP PAC brain or rack-mounted controller, using the streaming area (memory map address 0xF03FFFC4) with data sizes greater than 2051 bytes will cause buffer overflows, resulting in silent corruption and/or a reset of the brain.

If corruption occurs without a reset, the streaming configuration area will no longer be able to stream.

Data sizes of 2052-2095 bytes cause silent corruption, requiring a reset before streaming will work again.

Data sizes of 2096 bytes and greater cause resets, generally within 1-10 repeats of the stream (for example, if the stream time is set for 1 second, it will reset within 1-10 seconds). Some of these resets are preceded by the Fatal Error blink code (5 red blinks). Others simply reset the controller or brain.

WORKAROUND

Avoid configuring Streaming with more than 2051 bytes.

If you suspect that corruption has occurred, reset the brain to re-enable streaming.

RESOLUTION

Opto 22 has resolved this issue.

Relevant Downloads
No relevant downloads have been specified.
Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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